Russian internet trolls bought Facebook ads promoting the Black Lives Matter movement to stir up fear and cause political chaos in Baltimore and Ferguson, Missouri, during the 2016 presidential election, a report says.

Sources tell CNN that a Kremlin-backed group known as the “Internet Research Agency” used geographically targeted advertising to fuel political discord in various parts of the US as tensions rose between the black community and police last year.

At least one of the roughly 3,000 ads that the agency bought during the election promoted Black Lives Matter specifically, the outlet reports.

The ad, which was first posted in late 2015 or early 2016, appeared to support the social justice movement — but sources said it could also be seen as depicting it in a negative light.

“This is consistent with the overall goal of creating discord inside the body politic here in the United States, and really across the West,” explained Steve Hall, former CIA officer and CNN National Security Analyst.

“It shows they the level of sophistication of their targeting,” he said. “They are able to sow discord in a very granular nature, target certain communities and link them up with certain issues.”

In addition to the BLM posts, sources told CNN that the Russians were pushing ads that promoted gun rights and the Second Amendment — as well as warnings about undocumented immigrants.

The ads were reportedly purchased through Facebook’s self-service ad model, which gives users the ability to target certain people based on their geographic location, demographic categories and specific interests.

What’s unclear, though, is how the Russians knew who to appeal to.

“Did they know this just by following political news in America?” asked Senator Mark Warner, the top-ranking Democrat on the Senate Intelligence Committee.

“Did they geo-target both geography and by demographics in ways that at least at first blush appear pretty sophisticated? These are the kind of questions that we need to get answered and that’s why we need them in a public hearing.”

While the intelligence committee is still in the midst of its investigation, Republican Sen. Richard Burr, who is chairman, said Tuesday that there’s “no evidence yet” that the Russians and Trump officials colluded on the Facebook ads.

The social media giant did not comment on the CNN report, but did refer back to a statement from earlier this month from chief security officer, Alex Stamos.

“The vast majority of ads run by these accounts didn’t specifically reference the U.S. presidential election, voting or a particular candidate,” Stamos said. “Rather, the ads and accounts appeared to focus on amplifying divisive social and political messages across the ideological spectrum — touching on topics from LGBT matters to race issues to immigration to gun rights.”